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Mobile Sauna Build | Seattle, WA

8x16 Custom Mobile Sauna for Good Day Sauna

In July and August 2025, we built and delivered a fully custom 8×16 mobile sauna to Seattle, Washington for Good Day Sauna. This project was designed as a high capacity, off grid capable sauna built specifically for business use. With a hydraulic trailer system, custom porthole window, mirror pane privacy glass, and cedar accent features throughout, this build blends durability, mobility, and elevated design in one complete unit.
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Built for Business in Seattle, WA

A Commercial Mobile Sauna Designed to Stand Out

This 8×16 mobile sauna was built for a growing wellness business in Seattle with one goal in mind: create a large capacity unit that feels premium and operates smoothly in a commercial setting. The design blends traditional wood fired sauna culture with a bold modern exterior. Black metal siding contrasts with cedar accents, and the 4 foot circular porthole window creates a strong visual identity. Mirror pane privacy glass maintains a sleek exterior while protecting the guest experience inside. Built to travel and operate in multiple locations, the unit features a hydraulic drop axle trailer for easy setup and a solar powered lighting system, making it fully off grid capable.

Natural Light Without Compromising Privacy

Energy Efficiency and Heat Retention

Distinctive Visual Identity

✔ This 8 × 16 sauna sits on a 21-foot trailer and weighs approximately 5,300 pounds.
✔ Designed as a hot room only layout with two level benching, accommodating 15 to 20 guests.
✔ Interior includes 1×4 STK cedar walls and ceiling with matching cedar benches.
✔ Built with a sealed foil vapor barrier and airflow furring strips for proper ventilation.
✔ One piece commercial vinyl floor with integrated drain for easy cleaning.
✔ Custom 4-foot circular porthole window with dual pane insulated privacy tinted windows.
✔ Cedar slat accent walls with hidden LED lighting for added warmth and depth.
✔ Heated by the IKI Original Wood Stove with rocks and a double wall pipe system.
✔ Fully insulated build completed and delivered to Seattle in four weeks.

What sets BW saunas apart.

Industry-Leading Wall System
Heat faster & stay hotter.
Steel Trailer Frame
Mobile with the look and feel of a stationary.
Superior Heat Retention
R-13 standard insulation or R-15 fire resistant mineral wool.
Architectural Glass
Crystal clear views. Privacy when you want it.
Premium Sauna Heaters
Only the industry's best stoves: wood-fired, electric, or propane.
Integrated Lighting
Ambiance at every level.
Purpose-Built Flooring
Meant for water & sweat.
Exterior Finish Options
Designed to belong.

WE MAKE SAUNAS FOR WHERE YOU ARE

Frequently Asked Questions About Saunas

We are here for you. Let’s chat over a coffee if you’re in the Duluth area. If not, we are always available by phone to explore what an outdoor sauna could look like for your life.
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It depends on what you are searching for! If you want to rest, 15 to 30 minutes is plenty of time. If you want to cleanse and enhance your skin, 15 to 30 minutes is perfect. If you’re an athlete, resting after exercise can help minimize muscular pain and improve circulation.

For more information on this issue, please see “How long to stay in a sauna.“

Factors like weight, age, and exposure duration affect calorie burn in a sauna, with a 30-minute session potentially burning 100–300 calories. Harvard Health found that infrared saunas can burn up to 1.5 calories per minute, while the American Council on Exercise estimates 50–150 calories in a hot session.

For more information on this issue, please see

“Does sauna burn calories?“.

  • Listen to Your Body: If you feel uncomfortable, exit the sauna! It is better to prevent than to cure.
  • Stay Hydrated: Drink water before, during, and after your sauna session to replace lost fluids.
  • Session Duration: Two to three sessions per week, each lasting 15 to 20 minutes, is a decent start.
  • Sauna Etiquette: Shower before entering, dress lightly or with a towel for comfort, and keep talking to a minimal for a peaceful atmosphere.

For more information on this issue, please see “How long should you sit in a sauna?“.

The short answer is yes—with some restrictions. Saunas generally promote weight reduction by sweating, which allows the body to shed water weight momentarily. During a typical 30-minute sauna session, you can lose roughly 0.1 to 0.6 kg (0,22 to 1,32 pounds). However, this is primarily water weight, which will return as you rehydrate.

For more information on this issue, please see “Do saunas help you lose weight.”

Sauna bathing offers numerous health benefits, including weight control, hormonal balance, cardiovascular health benefits, musculoskeletal pain relief, muscle pain reduction, respiratory system benefits, and relaxation. It promotes a deep state of relaxation, reduces stress, and improves overall well-being.

For more information on this issue, please see “How long you should stay in a sauna.“

Sauna baths are safe for most healthy individuals, but precautions are needed for those with specific conditions like acute infections, heart problems, or fever. Heat exposure can affect certain drugs’ pharmacokinetics, so high blood pressure medicines should be taken before use. Also, saunas are safe for children to use under adult supervision.

For more information on this issue, please see “How long you should stay in a sauna.“

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A Personal Experience

Finding Resonance

In the world, everything has a resonant frequency. From a board, to the engine in your car. We’ve captured this into instruments such as the marimba. A simple line of wood specifically sized to create notes. That note harmonizing perfectly with each other piece of wood comes together into beautiful music when played skillfully. In sauna design, we feel the same. Bringing together finishes, materials and textures that harmonize together to create a masterpiece. Perfectly tuned to your goals, the end result is a warm inviting space that doesn’t distract, but guides you into the relaxation of sauna.

5.0 on Google · 28 reviews

"Working with Jayson and BW Sauna Co was a stellar experience in every way. I opened Seaside Sauna in Port Townsend, Washington at the end of May and every single person that enters the sauna says, WOW. I recommend working with BW Sauna Co to anyone who will listen."

Karyn Stillwell · Seaside Sauna, Port Townsend WA

"Jayson was professional, knowledgeable, and realistic about the steps needed to resolve the issue. He never tried to upsell us on products or repairs we didn't need. We wish we had begun our sauna journey with them from the start."

Stacy Crawford · Sauna Service and Troubleshooting

"After getting designs from a number of builders for a commercial use sauna we chose BW. Our running cost is well below what we were anticipating because the sauna runs so well. All of our guests, including some of Finnish heritage who grew up with sauna, have been impressed with the heat."

Shawn S. · Commercial Sauna, East Coast Delivery

"I've worked with a lot of sauna builders over the years. Their saunas are beautiful, built to last a lifetime, and reasonably priced. You simply will not find a better value for custom sauna and mobile sauna builds."

John Pederson · 612 Sauna Society, Six Builds

"Comparing BW to other mobile sauna manufacturers, his price is fair but the quality exceeded expectations. Thermally modified aspen smells nice and doesn't get hot. I'll be buying another mobile from BW in the future."

Brian Anderson · Mobile Sauna, Surfside Sauna

"Jayson and his team did an incredible job. They drove 27 hours from Minnesota to Arizona to deliver and install the unit in my spa. My customers are blown away and so am I."

Luke · Commercial Spa Installation, Arizona

"The woodwork is impeccable, the attention to detail in the construction is evident and the sauna fits perfectly in my backyard. It has transformed my outdoor space into a personal sanctuary that I look forward to visiting every day."

Andrew Burch · Custom Backyard Sauna

"This summer our sauna developed a few bulging boards and BW scheduled us in, came out and made the repairs, standing behind their work. This company is just awesome."

Niles Deneen · Custom Sauna, Minnesota

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Let’s build something that belongs.

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